- 您现在的位置：买卖IC网 > PDF目录10216 > SP3223EUEY-L/TR (Exar Corporation)IC TXRX RS232 INTELLIGNT 20TSSOP PDF资料下载
参数资料
| 型号： | SP3223EUEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 INTELLIGNT 20TSSOP |
| 产品变化通告： | Packaging Change 15/Jul/2010 |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
3
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP3223E/EB/EU_0_06272
AUTO ON-LINE Circuitry
The
SP3223 device has AUTO ON-LINE
circuitry on board that saves power in ap-
plications such as laptop computers, PDA's,
and other portable systems.
The
SP3223 device incorporates an AUTO
ON-LINE circuit that automatically enables
itselfwhentheexternaltransmitterisenabled
and the cable is connected. Conversely,
the
AUTO ON-LINE circuit also disables
most of the internal circuitry when the device
is not being used and goes into a standby
mode where the device typically draws A.
This function is externally controlled by the
ONLINE pin. When this pin is tied to a logic
LOW, the
AUTO ON-LINE function is ac-
tive. Once active, the device is enabled until
there is no activity on receiver inputs. The
receiver input typically sees at least ±3V,
which are generated from the transmitter
at the other end of the cable with a ±5V
minimum. When the external transmitter is
disabled or the cable is disconnected, the
receiver input will be pulled down by its
internal 5k resistor to ground. When this
occurs over a period of time, the internal
transmitters will be disabled and the device
goes into a shutdown or standby mode.
When the ONLINE pin is HIGH, the
AUTO
ON-LINE mode is disabled.
The
AUTO ON-LINE circuit has two
stages:
) Inactive Detection
2) Accumulated Delay
The first stage, shown in Figure 22, detects
an inactive input. A logic HIGH is asserted
on R
XINACT if the cable is disconnected
or the external transmitters are disabled.
Otherwise, R
XINACT will be at a logic LOW.
This circuit is duplicated for each of the other
receivers.
The second stage of the
AUTO ON-LINE
circuitry, shown in Figure 23, processes
the receiver's R
XINACT signal with an ac-
cumulated delay that disables the device to
a A typical supply current. The STATUS
pin goes to a logic LOW when the cable
is disconnected, the external transmit-
ter is disabled, or the SHUTDOWN pin is
invoked. The typical accumulated delay
is around 20s. When the
SP3223 drivers
and internal charge pump are disabled, the
supply current is reduced to A typical.
This can commonly occur in handheld or
portable applications where the RS-232
cable is disconnected or the RS-232 drivers
of the connected peripheral are truned off.
The
AUTOON-LINE modecanbe disabled
by the SHUTDOWN pin. If this pin is a logic
LOW, the
AUTO ON-LINE function will not
operate regardless of the logic state of the
ONLINE pin. Table 5 summarizes the logic
of the
AUTO ON-LINE operating modes.
Thetruthtablelogicofthe
SP3223driverand
receiver outputs can be found in Table 3.
The STATUS pin outputs a logic LOW signal
if the device is shutdown. This pin goes to
a logic HIGH when the external transmitter
is enabled and the cable is connected.
When the
SP3223 device is shutdown, the
charge pumps are turned off. V+ charge
pump output decays to V
CC,the V- output
decays to GND. The decay time will depend
on the size of capacitors used for the charge
pump. Once in shutdown, the time required
to exit the shut down state and have valid
V+ and V- levels is typically 200s.
For easy programming, the STATUS can
be used to indicate DTR or a Ring Indicator
signal. Tying ONLINE and SHUTDOWN
together will bypass the
AUTO ON-LINE
circuitry so this connection acts like a shut-
down input pin
相关PDF资料 |
PDF描述 |
|---|---|
| SF4381V-2FPG-3ES | CONN RCPT 2POS PNL MNT PIN |
| SP3223EUEA-L/TR | IC TXRX RS232 INTELLIGENT 20SSOP |
| CXS3106A184P | CONN PLUG 4POS STRGHT PIN |
| SF7281-3PG-3ES | CONN RCPT 3POS PNL MNT PIN |
| T 3507 100 | CONN FMALE RCPT 8POS REAR PNL MT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3223EY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223H | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
发布紧急采购，3分钟左右您将得到回复。